Porous Conjugated Polymer Nanotip Arrays for Highly Stable Field Emitter

Large area (26.7 cm²) nanotip arrays of porous conducting poly [5, 10, 15, 20-tetra (4-ethynylphenyl) porphyrin] diyne (TEPPD) have been successfully fabricated by an in situ cross-coupling reaction on the surface of the copper foil, which will open a new routine for large-area nanofabrication of porous conducting polymer on a conducting substrate. The surface-area of TEPPD nanotip arrays is up to 146 m²/ g. Interestingly, the nanotip arrays of TEPPD display a good field-emission property and exhibit a better stability of field emission than that of organic and polymeric nanostructures because of the good heat radiation of porous, which is comparable to some important nanostructures of inorganic semiconductor. The porous conducting polymer could be used for new field-emission emitter and other molecular electronic devices

Inorganic–Organic p‑n Heterojunction Nanotree Arrays for a High-Sensitivity Diode Humidity Sensor

Large-area and ordered arrays (16 cm²) of an inorganic–organic p-n heterojunction nanotree (NT) were successfully fabricated. The nanotree arrays consist of ZnO nanorods (NRs) as backbones and CuTCNQ (TCNQ = 7,7,8,8-tetracyanoquinodimethane) NRs as branches. The sizes of CuTCNQ NRs can be tuned by the thickness of the Cu layer deposited on the surface of ZnO NR. The CuTCNQ/ZnO NT arrays displayed excellent diode nature and obvious size-dependent rectification ratios were observed. Moreover, the CuTCNQ/ZnO NT arrays were first applied for the fabrication of a diode-type humidity sensor, which displayed ultrahigh sensitivity and quick response/recovery properties at room temperature. The detection limitation of this new diode-type humidity sensor lowers to 5% relative humidity (RH)

DNA Adducts in Aldehyde Dehydrogenase-Positive Lung Stem Cells of A/J Mice Treated with the Tobacco Specific Lung Carcinogen 4‑(Methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK)

Lung cancer is the leading cause of cancer death in the world. Evidence suggests that lung cancer could originate from mutations accumulating in a subpopulation of self-renewing cells, lung stem cells. Aldehyde dehydrogenase (ALDH) is a marker of stem cells. To investigate the presence of DNA modifications in these cells, we isolated ALDH-positive lung cells from A/J mice exposed to the lung carcinogen 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone. Using LC–NSI-HRMS/MS–PRM, <i>O</i>⁶-methyl-G, 7-POB-G, and <i>O</i>²-POB-dT were positively identified in ALDH-positive cell DNA. This is the first example of detection of carcinogen-DNA adducts in lung stem cells, supporting the hypothesis of their role in lung carcinogenesis

Synthesizing Axial Inserting p–n Heterojunction Nanowire Arrays for Realizing Synergistic Performance

Consideration of the material design and components match on structure and energy, the solid–solid combined nanowires of p-type conductive polymer of poly­[3-thiophene carboxylic acid methyl ester] (PTCM) and n-type inorganic semiconductor PbS was prepared with a 2.57 μm² heterojunction interface. The axial deeply inserting heterojunction nanowire arrays exhibited excellent rectifying features and diode nature, as well as obvious electrical switching behavior, which are much excelled individual components of PTCM and PbS nanowire arrays for realizing synergistic performance

Architecture of CuS/PbS Heterojunction Semiconductor Nanowire Arrays for Electrical Switches and Diodes

CuS/PbS p–n heterojunction nanowires arrays have been successfully synthesized. Association of template and DC power sources by controllable electrochemistry processes offers a technique platform to efficiently grow a combined heterojunction nanowire arrays driven by a minimization of interfacial energy. The resulting p–n junction materials of CuS/PbS show highly uniform 1D wire architecture. The single CuS/PbS p–n heterojunction nanowire based devices were fabricated, and their electrical behaviors were investigated. The independent nanowires exhibited a very high ON/OFF ratio of 1195, due to the association effect of electrical switches and diodes